Cyclopropane derivative fungicides

ABSTRACT

Fungi are controlled by certain derivatives of 1,1dihalocyclopropanes.

United States Patent [191 Hunter et al.

[ Dec. 24, 1974 CYCLOPROPANE DERIVATIVE FUNGICIDES [75] Inventors: Susan F. Hunter, Wye, near Ashford; Clive B. C. Boyce, Herne Bay; Brian P. Armitage, Sittingbourne; Pieter Ten Haken, Herne Bay, all of England; Willem M. Wagner, Amsterdam, Netherlands [73] Assignee: Shell Oil Company, New York, NY.

[22] Filed: June 18, 1973 [21] Appl. No.: 371,214

Related U.S. Application Data [62] Division of- Ser. No. 246,226, April 21, 1972,

abandoned.

[30] Foreign Application Priority Data.

Apr. 23, 1971 Great Britain 011029/71 [52] U.S. Cl 424/317, 424/180, 424/220, 424/263, 424/267, 424/270, 424/274, 424/275, 424/304, 424/305, 424/315 [51] Int. Cl A01n 9/24 [58] Field of Search 424/317; 260/514 N [56] References Cited UNITED STATES PATENTS 3,320,121 5/1967 Douros 424/317 3,567,740 3/1971 Matsui et a1. 424/306 X 3,678,172 7/1972 Hill 424/306 FOREIGN PATENTS OR APPLICATIONS 978,352 12/1964 Great Britain 260/514 H Primary ExaminerAlbert T. Meyers Assistant ExaminerLe0nard Schenkhan [57] ABSTRACT Fungi are controlled by certain derivatives of 1,1- dihalocyclopropanes.

3 Claims, No Drawings CYCLOPROPANE DERIVATIVE FUNGICIDES This is a division of application Ser. No. 246,226 filed Apr. 21, 1972, now abandoned.

FIELD OF THE INVENTION This invention relates to the use as fungicides of certain derivatives of 1,1-dihalocyclopropanes, some of which are novel, and to fungicidal formulations of such derivatives.

DESCRIPTION OF THE PRIOR ART A search has disclosed the following patents which describe various derivatives of 1 ,1- dihalocyclopropanes, exhibiting various kinds of utility: US. Pat. Nos. 3,012,079; 3,047,61l; 3,047,633; 3,074,984; 3,301,896; 3,320,121 and 3,558,726, and Netherlands Pat. No. 7010079.

PREFERRED EMBODIMENTS OF THE INVENTION The present invention provides a class of fungicides and fungicidal formulations containing them, said fungicides having the general formula:

wherein Hal is halogen; R, is hydrogen or alkyl or phenyl; R and R each is hydrogen or alkyl; and R, is cyano, carboxyl or thiocarboxyl, or a salt, ester or optionally mono-N-substituted amide thereof. Examples of suitable substituents on the amide group are phenol, carbamoyl or lower carboxyalkyl.

Preferred fungicides of this class are those in which Hal is chlorine or bromine; R, is hydrogen, alkyl of 1-6 carbon atoms, for example methyl or ethyl, or phenyl; R and R each is hydrogen or alkyl of 1-6 carbon atoms, for example, methyl or ethyl; and R, is cyano, carboxyl or one of the following derivatives thereof:

a. an alkali metal salt b. an alkyl ester in which the alkyl group contains from one to 12 carbon atoms, for example methyl, ethyl, isopropyl, butyl, isobutyl, s-butyl, t-butyl, hexyl, octyl or dodecyl, or is an alkyl group of 1-6 carbon atoms substituted by a chlorine atom, by one or two hydroxy groups, or by a mercapto, phenyl, phthalimido, cyclohexene-l,2-dicarboximido, bicycloheptadienyl, pryidyl or trialkyldioxolanyl group, for example chloroethyl, hydroxyethyl, dihydroxy-isobutyl, mercaptoethyl, benzyl, phthalimidomethyl, cyclohexene-l ,2- dicarboximidomethyl, bicycloheptadienylmethyl, pyridylmethyl or trimethyl-dioxolanylmethyl; a cycloalkyl, alkenyl or alkynyl ester of up to seven carbon atoms, for example cyclohexyl, propenyl r propynyl; a phenyl ester in which the phenyl group optionally is substituted, for example in the 4- position, by chloro, nitro, methyl or methoxy; a sulpholanyl ester; a dialkylthiazoyl ester, for example an isopropylmethylthiazolyl ester; a pyridyl ester; or an aldohexose ester, for example a glucose ester.

c. an amide optionally mono-N-substitut'ed by phenyl, carbamoyl or carboxymethyl,

d. a thiocarboxyl ester in which the ester moiety is an optionally hydroxy-substituted alkyl group, for example methyl or hydroxyethyl, a benzyl or a phenyl-substituted thiazole group.

A particularly preferred subclass of these fungicides consists of those in which Hal is chlorine; R, and R each is methyl or ethyl; R is hydrogen; and R, is carboxyl, the sodium salt thereof, or an alkyl ester thereof in which the alkyl group is an optionally hydroxysubstituted alkyl of l-6 carbon atoms.

Examples of the particularly preferred subclass are 2,2-dichloro-3,3-dimethylcyclopropane carboxylic acid; the sodium salt thereof and the methyl and hydroxyethyl esters thereof.

The invention includes also, as novel compounds, cyclopropane derivatives of formula I wherein Hal is halogen; R, and R each is alkyl; R, is hydrogen or alkyl, and R, is cyano, carboxyl, or a salt, ester or optionally mono-N-substituted amide thereof, or an esterified thiocarboxyl group, with the proviso that when Hal is chlorine, R, and R each is methyl, and R is hydrogen, then R, is other than a carboxyl group or a methyl, ethyl or benzylfu'rfuryl ester thereof.

Subject to this proviso the preferred novel fungicides are those wherein Hal is chlorine, or bromine; R, and R each is alkyl of l-6 carbon atoms, for example methyl or ethyl; R is hydrogen or alkyl of 1-6 carbon atoms, for example methyl; and R, is as defined in relation to the preferred fungicides.

Particularly preferred of these fungicides are the sodium salt and hydroxyethyl ester of 2,2-dichloro-3,3- dimethylcyclopropane carboxylic acid.

The cyclopropane derivatives of formula I wherein R, is an alkyl ester of a carboxyl group may be prepared by a process which comprises reacting an ester of an alpha,beta-unsaturated carboxylic acid of formula:

C=C COOR i wherein R is alkyl, with a compound capable of yield ing a dihalocarbene, for example, sodium trichloroacetate, phenyl tribromomethylmercury or phenyl trichloromethylmercury.

The compounds wherein R, is carboxyl are prepared by a process which comprises 'hydrolyzing the corresponding alkyl ester under aqueous acidic or basic conditions.

The salts of those compounds'wherein R, is carboxyl are obtained by neutralizing the acid with the appropriate base.

Esters of those compounds wherein R, is carboxyl or thiocarboxyl are obtained by preparing an acid halide of formula:

Hal Hal R1 R! R2 0 O X (HI) wherein X is halogen, suitably chlorine, and reacting this halide with the appropriate compound containing a hydroxy or mercnpto group, in the presence of a hydrogen halide acceptor, for example a tertiary amine such as a triethylamine or pyridine.

Optionally mono-N-substituted amides of those compounds wherein R is carboxyl are obtained by reacting an acid chloride of formula (111) with ammonia or the appropriate compound containing a primary amino group.

The compounds wherein R is cyano are obtained by dehydrating the corresponding amide using phosphorus pentoxide.

The fungicidal activity of the compositions and compounds of the invention is especially marked against fungal diseases of rice crops, in particular against rice blast (Pyricularia oryzae). The invention includes therefore a method of protecting crops, especially rice crops, against fungal attack, in which the crops, the seeds thereof, or soil or water in which the crops are growing or are to be grown are treated with a fungicidally effective amount of a cyclopropane derivative of formula (1) or a composition according to the invention.

The term carrier as used herein means a solid or fluid material, which may be inorganic or organic and of synthetic or natural origin, with which the active compound is mixed or formulated to facilitate its application to the plant, seed, soil or other object to be treated, or its storage, transport or handling.

The surface-active agent may be an emulsifying agent or a dispersing agent or a wetting agent; it may be nonionic or ionic.

Any of the carrier materials or surface-active agents usually applied in formulating pesticides may be used in the compositions of the invention and suitable examples of these are to be found, for example, in British Pat. No. 1,232,930.

The compositions of the invention may be formulated as wettable powders, dusts, granules, solutions, emulsifiable concentrates, emulsions, suspension concentrates or aerosols. Wettable powders are usually compounded to contain 25, 50 or 75%wof toxicant and usually contain, in addition to solid carrier, 3l0%w of a dispersing agent and, where necessary, l0%w of stabilizer(s) and/or other additives such as penetrants or stickers. Dusts are usually formulated as a dust concentrate having a similar composition to that of a wettable powder but without a dispersant, and are diluted in the field with further solid carrier to give a composition usually containing /2-l0%w of toxicant. Granules are usually prepared to have a size between and 100 BS mesh (l.676-0.152 mm), and may be manufactured by agglomeration or impregnation techniques. Generally, granules will contain /2-25% toxicant and 010%w of additives such as stabilizers, slow release modifiers and binding agents. Emulsifiable concentrates usually contain, in addition to the solvent and, when necessary, co-solvent, 10-50% w/v toxicant, 220% w/v emulsifiers and 0-20% w/v of appropriate additives such as stabilizers, penetrants and corrosion inhibitors. Suspension concentrates are compounded so as to obtain a stable, non-sedimenting, flowable product and usually contain 1075%w toxicant, 0.5%w of dispersing agents, 0.1-l0%w of suspending agents such as protective colloids and thixotropic agents, 0l0%w of appropriate additives such as defoamers, corrosion inhibitors, stabilizers, penetrants and stickers, and as carrier, water or an organic liquid in which the toxicant is substantially insoluble; certain organic solids or inorganic salts may be dissolved in the carrier to assist in preventing sedimentation or as antifreeze agents for water.

Aqueous dispersions and emulsions, for example,

EXAMPLE 1 Methyl 2,2-dichloro-3,3-dimethylcyclopropanecarboxylate Dry sodium trichloroacetate (126 grams) was added over a period of 1% hours to methyl 3,3- dimethylacrylate (114 grams) at 115 C. The mixture was heated for a further 2 hours at 1 15 C. The mixture was filtered and the filtered solid was washed with chloroform (50 milliliters). The combined filtrate and washings was fractionally distilled and the desired product was obtained as a colorless liquid, boiling point 8687 C at 15 torr.

EXAMPLE ll 2,2-Dichloro-3,3-dimethylcyclopropanecarboxylic acid Methyl 2,2-dichloro-3,3-dimethylcyclopropanecarboxylate (157 grams) prepared as in Example 1, formic acid (73.6 grams) and concentrated sulfuric acid (2 milliliters) were heated together at l0O-l 15 C until conversion to the acid was completed as shown by gasliquid chromatography. The mixture was cooled and filtered. The solid obtained was washed with a little water and dried to yield the desired product as a solid melting point: l11.5-l12.5 C.

EXAMPLE [[1 Sodium 2,2-dichloro-3,B-dimethylcyclopropanecarboxylate 2,2-Dichloro-3,3-dimethylcyclopropane carboxylic acid (27.9 grams) was suspended in water (100 milliliters) and the suspension was treated with sodium bicarbonate (13.0 grams). The resulting solution was evaporated to dryness under reduced pressure and the residue was dissolved in ethanol (400 milliliters) and filtered. The required product was obtained by precipitation from the ethanol solution by addition of ether.

EXAMPLE IV 2,2-Dichloro-3,3-dimethylcyclopropanoyl chloride 2,2-Dichloro-3,3-dimethylyclopropane carboxylic acid (183 grams) and thionyl chloride (119 grams) were heated together under reflux for 4 hours. The reaction mixture w'as then fractionally distilled and the required product was obtained as a colorless liquid, boiling point C at 13 torr.

EXAMPLE V 2-l-Iydroxyethyl 2,2-dichloro-3,3-dimethylcyclopropane-carboxylate 2,2-Dichloro-3,3-dimethylcyclopropanoyl chloride (11.1 grams) was added to a mixture of glycol (31 grams) and pyridine (100 milliliters) cooled to C. The mixture was allowed'to stand at 0 for 1 hour and then at room temperature for 1 hour. The mixture was heated to 100 C for a further 1 hour and then poured into an ice/water mixture. The aqueous mixture was extracted with ether (3 X 50 milliliters) and the combined extracts were washed successively with 10% hydrochloric acid, sodium bicarbonate solution and water. The ether was removed under reduced pressure and the residue was fractionally distilled to yield the required product, boiling point, l52l54 C at 13 torr.

EXAMPLE VI S-methyl 2,2-dichloro-3,3-dimethylcyclopropanethiocarboxylate Triethylamine (22.2 grams) was added to a solution of methyl mercaptan (48 grams) in benzene (100 milliliters) maintained at 5 C. 2,2-Dichloro-3,3- dimethylcyclopropanoyl chloride (40.3 grams) was then added to the stirred mixture at 5 C over a period of 30 minutes. The mixture was stirred for a further 3 hours in an ice bath and then allowed to stand at room temperature for 16 hours. The mixture was then shaken with water, followed by 5% hydrochloric acid. The solvent was removed under reduced pressure and the residue purified by distillation to yield the required product, boiling point 84 C aat 2 torr.

EXAMPLE VII 2,2-Dichloro-3,3-dimethylcyclopropane carboxamide 2,2-Dichloro-3,3-dimethylcyclopropanoyl chloride was reacted with an excess of cold aqueous ammonia solution (-35%) to yield the crude product, which was recrystallized from methanol to give a white solid, melting point 77-79 C.

EXAMPLE VIII EXAMPLE IX N-(2,2-dichloro-3,3-dimethylcyclopropanoyl) glycine Glycine (2.0 grams) and sodium hydroxide (1.0 grams) were dissolved in water (20 milliliters) and the solution cooled in ice. A solution of sodium hydroxide (1.0 gram) in water milliliters) and 2,2-dichloro- 3,3-dimethylpropanoyl chloride (4.2 grams) were added simultaneously over a period of IO minutes to the sodium glycinate solution. The mixture was allowed to stand for minutes and was then treated with concentrated hydrochloric acid to pH 1. The oil which separated was extracted with ether and the extracts were washed with water, dried and evaporated under reduced pressure. The solid obtained was shaken with benzene to remove the last traces of the acid chloride and leave the pure product, melting point, l38-l40 C.

EXAMPLE x Glucose esters of 2,2-Dichloro-3,3-dimethylcyclopropane-carboxylic acid (a) Dry D(+) glucose (33.75 grams) was dissolved in dry pyridine (250 milliliters) and to this solution at -5 was added 2,2-dichloro-3,3-dimethylcyclopropanoyl chloride (5.0 grams) in dry chloroform (10 milliliters). The mixture was allowed to stand at 5 C for 1 hour then at room temperature. The supernatant liquid was decanted off, mixed with water (300 milliliters) and extracted with ether (2 X 150 milliliter). The extracts were washed with water (4 X 300 milliliters), dried and the solvent removed under reduced pressure. The residue was chromatographed on silica gel using mixtures of chloroform and ethyl acetate as eluant and three components were obtained as oils 1. a glucose monoester 2. a glucose di-ester 3. a glucose tri-ester b. When the procedure of (a) was repeated using an excess of the acid chloride a glucose penta-ester was obtained, melting point 6263 C.

EXAMPLE XI EXAMPLE XII 2,3-dihydroxy-2-methylpropyl dimethylcyclopropane-carboxylate 2,2,4-Trimethyl-1,3-dioxolan-4-ylmethyl 2,2- dichloro-3,3-dimethylcyclopropane carboxylate (6.0 grams, prepared as in previous example) was dissolved in 50% aqueous ethanol milliliters) containing concentrated hydrochloric acid (3 milliliters) and the solution was allowed to stand for 48 hours at room temperature. The solvent was then removed under reduced pressure and the residue was crystallized from cyclohexane to give the desired product, melting point, 54.5-55 C.

2,2-dichloro-3,3-

EXAMPLE XIII 2,2-Dichloro-l ,3,3-trimethylcyclopropanecarboxylic acid Ethyl 2,2-dichloro-l,3,3-trimethylcyclopropanecarboxylate (7.3 grams) was. heated under reflux for 1 hour with a 5% solution of sodium hydroxide in aqueous ethanol (40 milliliters). About 15 milliliters of ethanol was then removed by distillation and the remaining solution was shaken with ether. The aqueous layer was separated and acidified to give the free acid. The ether layer was shaken with aqueous sodium bicarbonate solution and the aqueous layer was separated and acidified to give a further quantity of the free acid. The crude material was recrystallized from hot water to give the desired product, melting point, 144 C.

EXAMPLE XIV product, boiling point, 120-122 C at 12 torr.

EXAMPLE xv Methyl 2,2-dibrom-3,3-dimethylcyc1opropanecarboxylate Methyl 3,3-dimethy1acrylate (12.8 grams) and phenyl tribromomethylmercury were reacted together in similar manner to that of the previous example to yield the required product, boiling point 1 10-112 C at 13 torr.

EXAMPLE XVI Following procedures similar to those given in the previous examples, further cyclopropane derivatives were prepared, whose physical characteristics are set out in Table 1.

TABLE I Compound C. Melting Point C, Boiling Point (torr) 2,2-dich1oro-3,S-dimethylcyclopropane-N-pheny1carboxamide phenyl 2,2-dich1oro-3,3-dimethy1- cyclopropane-carboxylate ethyl 2,2-dich1oro-3,S-dimethylcyclopropane-carboxylate ethyl 2,2-dich1oro-1,3,3-trimethy1- cyclopropane carboxylate butyl 2,2-dich1oro-3,S-dimethylcyclopropane carboxylate hexyl 2,2-dich1oro-3,3-dimethy1cyc1opropane carboxylate oil benzyl 2,2dichloro-3,3-dimethy1- cyclopropane carboxylate oil t-butyl 2,2-dich1oro-3,3-dimethy1- cyclopropane carboxylate oil ethyl 2,2-dich1oro-3-methy1cyc1opropane-l-carboxylate methyl 2,2-dich1oro-3-pheny1cyc1opropane-l-carboxylate 2,2-dichloro-3-pheny1cyc1opropanel-carboxylic acid octyl 2,2-dichloro-3.3-dimethy1- cyc1opropane-carboxylate oil dodecyl 2,2-dich1oro-3,3-dimethylcyclopropane carboxylate oil methyl 2.2-dich1oro-1-methy1cyc1opropane-carboxylate phthalimidomethyl 2,2-dich1oro-3J- dimethylcyclopropane carboxylate cyclohex- 1 -en-1 ,Z-carboximidomethyl 2,2-dich1oro-3,B-dimethylcyclopropanecarboxylate cyc1ohex-3-en-1,Z-carboximidomethyl 2,2-dich1oro-3,B-dimethylcyclopropanecarboxylate N-2,2-dich1oro-3,S-dimethylcyclopropanoyl) urea S-(4-pheny1thiazo1-2-y1) 2,2- dich1oro-3.3-dimethylcyclopropanethiocarboxylate bicyclo (2,2,1) hepta-2,5-dien-2- 2-y1methy1 2,2-dichloro-3,3-dimethylcyclopropane-carboxylate sulpholan-3-y1 2,2-dich1oro-3,3- dimethylcyclopropane-carboxylate 2,2-dich1oro-B-methylcyclopropanel-carboxylic acid oil carboxylic acid C, Melting Compound Point C. Boiling Point (torr) S-benzyl 2,2-dichloro-3,3-dimethylcycIopropane-thiocarboxylate 2 -chloroethyl 2,2-dichloro-3,3- d1methylcyclopropane-carboxylate isopropyl 2,2-dichloro-3,3-dimethylcyclopropane-carboxylate allyl 2,2-dichloro-3,3-dimethylcyclopropane carboxylate propargyl '2,2-dichloro-3 ,S-dimethylcyclopropane-carboxylate cyclohexyl 2,2-dichloro-3,3dimethylcyclopropane-carboxylate s-butyl 2,2-dichloro-3,3-dimethylcyclopropane-carboxylate isobutyl 2.2-dichloro-3,3-dimethylcyclopropane-carboxylate 2-mercaptoethyl 2,2-dichlro-3,3- drmethylcyclopropane-carboxylate S-(Z-hydroxyethyl) 2,2-dichloro-3.3- dimethylcyclopropane-thiocarboxylate 4-nitrophenyl 2,2-dichloro-3,B-dimethylcyclopropane-carboxylate 72-74 4-chlorophenyl 2,2-dichloro-3,3-dimethylcyclopropane-carboxylate 56.5-58

4-methoxyphenyl 2,2-dichloro-3,3-dimethylcyclopropane-carboxylate p-tolyl 2.2-dichloro-3,S-dimethylcyclopropane-carboxylate Z-methyl-4-isopropylthiazol-5-yl 2,2-dichloro-3,3-dimethyl-cyclopropane-carboxylate methyl 2,2-dichloro-l,3-dimethylcyclopropane-l-carboxylate 2,2-dichloro-l ,3-dimethylcyclopropanel-carboxylic acid 80-81 pyrid-3-ylmethyl 2,2-dichloro-3,3- dimethylcyclopropane carboxylate pyrid-3-yl 2.2-dichloro-3,3-dimethylcyclopropane carboxylate 61-63 2,2-dichloro-3,3-diethylcyclopropane- (N-phenyllcarboxamide 98-99 2,2-dichloro-3,3-diethylcyclopropane carboxylic acid 77-78 2,2-dibromo-3,B-dimethylcyclopropane EXAMPLE XVII Fungicidal Activity against Pyricularia oryzae (rice blast) The cyclopropane derivatives of the invention were .tested for activity against rice blast in the following manner:

Rice plants were grown from seed in soil contained in seven 5 centimeter diameter pots. After 8 days the soil was drenched with 50 millimeters of an aqueous solution of suspension containing 250 parts per million of the test compound. Two days after drenching the plants were inoculated with spores of Pyricularia aryzae (rice blast) Observations on the development of the disease were made after a further 6 days.

oil

oil

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The results of the tests are set out in Table 2, in which a result 2 indicates more than 80% control of the fungus, a result 1 indicates -80% control and a result 0 indicates less than 50% control.

EXAMPLE XVIII leaving the third expanded leaf unsprayed. Two days after treatment the plants were inoculated with spores TABLE 2 Continued Hal Hal of Uromyces fabae and observations on the develop- 1 R ment of the rust-symptoms were made after a further 7 fl 3 8 days. 5 2

ii. Cucumber plants were sprayed on the upper sur- Cmvound v y faces of the first leaf and the lower surface of the sec- Hal R1 R2 R3 R1 ond leaf leaving the third and fourth leaves unsprayed. C1 5 CH3 m 2 The upper surfaces of all leaves were inoculated with 8%: gi 6 H 88 gHze 3 spores of Erysrphe czchoracearum 2 days after treat- 10 gm E 8880mm)3 2 ment. Assessments of the fungal lnfectlon were made g ggggi f g A quantity of 12 milligrams of the finely ground test 0 H L 3 compound was applied to the surface of each of three 15 000011110 soil samples, which were then sown each with 12 wheat \f/ seeds which were covered with soil and allowed to grow for 10 days. The resulting plants were then inoculated 01 CH1 CH3 H 2 with spores of Puccine recondita (brown rust) and ob- S servations on the development of the fungus were made after 7 days. 000

The results of these tests are set out in Table 3 in C1 CH3 CH3 H CN 1 which a result 2 indicates more than 80% control of the gg f gggg O H 1 3 fungus, l lndlcates 50-80% control and 0 indicates less 8g; 0%: H ooocnzc HicHZ i a C 3 H C O S CH than 50% control. C1 C 3 CH3 H COOCHZCHQSH i TABLE 2 01 CH3 CH3 H 00 S 01120112011 1 Cl CH3 CH3 H 1 Hal Hal COOQNOZ R17 a Cl CH3 CH3 H 1 R2 R4 ooo--cl Compound Activity against Hat R1 R2 R3 t W 01 CH3 H 00O 1 s a 2 01 0H: CH3 H 00NH0H5 0 01 H (CHQAEH Cl CH3 OH: H COOH 2 N C1 CH3 CH3 H COOCsHs 2 CH C1 CH3 CH3 H CONHz 2 a Cl CH3 OH: H 00002115 2 l- 01 CH3 CH3 CH3 C0002H5 0-1 000 01 CH3 OH: H coNHooNH 1 Cl CH3 OH; H 2 40 Cl cm 1 OH; H N 1-2 0o0 coocHlN I C1 CH3 CH3 H N 2 COOOH2 01 CH3 CH H CONHCH GOSH 1 3 2 (Cl CH3 CH3 H 000M Glucose 2 01 CH OH H COONa 2 e17 coo cHl lom 2 (01 3 H 000 Glucose 1 TABLE 3 Compound Fungicidal activity U. Fabae E. cicnorucearum Hal R1 R2 R3 R4 Direct Systemic" Direct Systemic P. recondila 0] CH3 OH; H CONHC6H5 1 0 0 0 1 Cl CH3 CH3 H CONHz 0 0 0 0 1 01 CH3 CH3 H 1 0 o COOCH? l r" I 01 OH; H H coorr 1 0 0 0 0 Cl CH3 CH3 H COSCH5 1 0 Cl CHa CH3 H (CH3)2(|JH 0 0 2 2 0 N IE I s 000 N 01 CH5 CH3 H (:00- 0 0 2 0 0 (C1 CH3 OH; H coon Glucose 2 0 0 0 0 Including translaminar effect 13 14 We claim as our invention: wherein each Hal is chlorine or bromine; R is a hydro- 1 A method of combatting the fungus P. oryzae gen, alkyl of 1-6 carbon atoms or phenyl; R and R which comprises contacting said fungus with a fungus each is hydrogen or alkyl of 1-6 carbon atoms; and R inhibiting amount of at least one compound of the foris carboxyl; or an alkali metal salt thereof. mula 5 2. The method of claim 1 in which each Hal is chlorine; R and R each is methyl or ethyl; R is hydrogen; and R is carboxyl; or the sodium salt thereof.

g 3. The method of claim 1 wherein the compound is 4 2,2-dichloro-3,3-dimethylcyclopropane carboxylic R2 R4 acid. 

1. A METHOD OF COMBATTING THE FUNGUS P. ORYZAE WHICH COMPRISES CONTACTING SAID FUNGUS WITH A FUNGUS INHIBITING AMOUNT OF AT LEAST ONE COMPOUND OF THE FORMULA
 2. The method of claim 1 in which each Hal is chlorine; R1 and R2 each is methyl or ethyl; R3 is hydrogen; and R4 is carboxyl; or the sodium salt thereof.
 3. The method of claim 1 wherein the compound is 2,2-dichloro-3, 3-dimethylcyclopropane carboxylic acid. 